1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <string.h>
18
19#include <utils/Errors.h>
20
21#include <gui/DisplayEventReceiver.h>
22#include <gui/IDisplayEventConnection.h>
23#include <gui/ISurfaceComposer.h>
24
25#include <private/gui/ComposerService.h>
26
27#include <private/gui/BitTube.h>
28
29// ---------------------------------------------------------------------------
30
31namespace android {
32
33// ---------------------------------------------------------------------------
34
35DisplayEventReceiver::DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource) {
36    sp<ISurfaceComposer> sf(ComposerService::getComposerService());
37    if (sf != NULL) {
38        mEventConnection = sf->createDisplayEventConnection(vsyncSource);
39        if (mEventConnection != NULL) {
40            mDataChannel = std::make_unique<gui::BitTube>();
41            mEventConnection->stealReceiveChannel(mDataChannel.get());
42        }
43    }
44}
45
46DisplayEventReceiver::~DisplayEventReceiver() {
47}
48
49status_t DisplayEventReceiver::initCheck() const {
50    if (mDataChannel != NULL)
51        return NO_ERROR;
52    return NO_INIT;
53}
54
55int DisplayEventReceiver::getFd() const {
56    if (mDataChannel == NULL)
57        return NO_INIT;
58
59    return mDataChannel->getFd();
60}
61
62status_t DisplayEventReceiver::setVsyncRate(uint32_t count) {
63    if (int32_t(count) < 0)
64        return BAD_VALUE;
65
66    if (mEventConnection != NULL) {
67        mEventConnection->setVsyncRate(count);
68        return NO_ERROR;
69    }
70    return NO_INIT;
71}
72
73status_t DisplayEventReceiver::requestNextVsync() {
74    if (mEventConnection != NULL) {
75        mEventConnection->requestNextVsync();
76        return NO_ERROR;
77    }
78    return NO_INIT;
79}
80
81
82ssize_t DisplayEventReceiver::getEvents(DisplayEventReceiver::Event* events,
83        size_t count) {
84    return DisplayEventReceiver::getEvents(mDataChannel.get(), events, count);
85}
86
87ssize_t DisplayEventReceiver::getEvents(gui::BitTube* dataChannel,
88        Event* events, size_t count)
89{
90    return gui::BitTube::recvObjects(dataChannel, events, count);
91}
92
93ssize_t DisplayEventReceiver::sendEvents(gui::BitTube* dataChannel,
94        Event const* events, size_t count)
95{
96    return gui::BitTube::sendObjects(dataChannel, events, count);
97}
98
99// ---------------------------------------------------------------------------
100
101}; // namespace android
102